Threshing mechanism



Aug. 17, 1943. 1.. A. PARADISE 4 THRESHING MECHANISM Filed March 27,1940 FIGS 35 FIG8 INVENTOR: LOUIS A. PARADISE A TTORN E Y5 Patented Aug.17, 1943 'rnnasnme MECHANISM Lorrie A. Paradise, Molina-111., assignorto Deere & Company, Moline, 111., a corporation of Illinois .Application March 27, 1940, Serial No. 326,199

1 Claim.

, The present invention relates to threshing mechanism and has for itsprincipal object the provision of a new and improved grate of the typewhich is generally disposedat the rear of the threshing concave forguiding the threshed grain and straw onto the straw rack. Itis commonpractice in thre sher design) to provide a beater or strippingcylinderdirectly behind the threshing cylinder and having projections orteeth which move past the surface of the threshing cylinder closelyadjacent thereto for strippingcff any. straw .that tends to cling to thethreshing cylinder andthrcw it .rearwardly to the straw racln Thisseparating cylinder is usually made cylindrical in form with radiallyoutwardly extending projections thereon forengaging the straw.Thepurposeof the cylindrical separator or beater is to deflect kernelsof grain which are thrown rearwardly by the threshing cylinder andprevent their being thrown out of the rear end of the machine, and bydeflecting the grain to the forward end of the straw rack, the grain isgiven a longer period of separation, with the ing made to the drawingappended hereto, inwhich l Figure 1 is a partial side elevation of athreshing mechanism including a grateembodying the I and arrangement ofthe bars in the grate; and

result that the efficiency of the straw rack and separator is increased.

It is alsocommon practice to provide a grate comprising a row of fingersextending. rear- 7 have discovered, however, that there is an appreciable number of kernels that are thrown through the gratebetween thelaterally spaced fingers and pass through the forward endv of thethresher body, landing upon the rear end of the straw rack or evenflying out of the open rear end of the body. It is, therefore, aspecific ob- ,iect of this invention to provide additional defleetingmeans for deflecting those kernels of grain which are thrown through thegrate between the fingers. In the accomplishment of this object I haveprovided a row of sub defiecting fingers in register with the spacesbetween the laterally spaced grate fingers and substantially equal inwidth to the spaces, so that any kernels which pass between the mainfingers strike the sub-deflecting fingers and are deflecteddownwardlyito the forward part of the separating shoe. I I

I will now describe. several embodiments of my invention, in which theseand other objects and faces are moving in opposite directions.

advantages will be made apparent, reference be.- 55

Figures 4 to 8, inclusive, are fragmentary sectional views similar toFigure 3 but showing modified forms of the fingers inthe grate.

Referring now to the drawing and more particularly tofFigures 1, 2 and3, the threshing mechanism comprises a threshing cylinder l0 of' more orless conventional type, rotatably mount-i ed on a shaft II which isjournaled in suitable bearings for rotation in a direction indicated, bythe arrow. A threshing concave I3 is disposed beneath the cylinder l 0,embracing the lower portion thereof and spaced from the cylinder toprovide a clearance I4 into which grain is fed by any suitable means tobe threshed by the actionof the rotating cylinder rubbing the grainagainst the stationary concave I 3 in a' manner well known to thoseskilled in they art. The cylinder I9 is shown as having conventional rubbars 15, but it is to beunderstood that my inventionis not limited toany particular kind of cylinder or concave. A rotary beater or sepa-Irating-cylinder lB is mounted directly behind the threshing cylinderilland is supported on a shaft 19- which is 'journaled in suitablebearings:

for rotation about an axis slightly higher than the axis of the cylinder1.. The separating cylinder !8 is adapted to rotate in the samedirection of rotation as that of the threshing cylinder l0 so that theiradjacent peripheral sur- Fixed to the outer surface of the separatingcylinder [8 are a plurality of axially extending rows of outwardlyprojecting spikes 20 which are adapted to pass closely adjacent to thesurface of the threshing cylinder I 0 and strip therefrom any strawwhich tends to cling to the rub bars l5, throwing the straw rearwardlyaway from'the threshing cylinder toward the right, as viewed in Figure1, where it is caught by the straw rack 2| which may be of any suitabledesign known to those skilled in the art. Any suitable separator shoe(not shown) may be provided beneath the straw rack 2|, but inasmuch asthe separator shoe forms no part of the present invention, it is and itsconbolts 30.

and rearwardly toward the separating cylinder I2 omitted from thedrawing for the sake of simplicity.

The threshed grain and straw are thrown rearwardly, or to the right, asviewed in Figure 1, by the action of the threshing cylinder l0, and theseparating cylinder I8 is provided with'an i p forate surface againstwhich some of the kernels of grain impinge and are deflected-therebydownwardly and rearwardly toward the straw rack 2 l.

Mounted on the rear end of the concave I3 is a finger grate, indicatedin its entirety by reference numeral 25. The grate 25 comprises a a rowof laterally spaced bars or fingers 26,- which are cylindrical in shapeand aresupported at their forward ends in a transversely extending U-shaped bracket member 2'1. The bars 26 extend through aligned aperturesin the downwardly extending flanges of the U-shaped or channelshapedbracket 21, and are suitably secured there-,

to as by welding. The bracket 21 is supported on a transverselyextending plate 28 by means of a row of bolts 29 which are disposedwithin the spaces between the bars 26. 'The supporting plate 28 'isfixed to the rearend of the concave I3 by The bars 26 extend obliquelyupwardly plane of the sub-deflecting bars with the plane of thehorizontal rear portions of the main deflecting bars 26.

Thus the lower bars 3! are disposed in register with the spaces betweenthe upper bars and are substantially equal in width to the spacesbetween the upper bars so that the two rows of bars provide a barrierwhich prevents grain from being thrown rearwardly from the threshingcylinder iii to any great extent. As indicated in Figure 3, theflloweror rear row of bars 3| comprise V- shaped members disposed with theirapices facing forwardly between the upper row of cylindrical bars 26.Thus, it isevident that any kernels of grain'which pass between thecylindrical bars 26 impinge against one of the sub-deflecting bars 3!and aredeflected laterally between the latter. The sub-deflecting barsare spaced rearwardly Figure 5.

from the upper or front row of bars 26 by means of a laterally extendingspacing block 32 against which the bars 3! are clamped by the bolts 29.The forward ends of the sub-deflecting bars abut against the lowerflange of the channel bracket 2?, whiclris appreciably longer than theupper flange thereof, as indicated in Figure 1.

Although the preferred shapes-of the bars 25, 3| are indicated in Figure3, undoubtedly other shapes will now be suggested to those skilled inthe art, examples of which are shown in Figures 4 to 8, inclusive. InFigure 4 both the upper and lower bars 26, 33 are shown cylindrical inform. In Figure 5 both the upper and lower rows of bars are shown asrectangular in cross section, while in Figure 6 the upper row of bars 26is shown cylindrical, as in Figure 3, while the lower row of bars 35 isshown rectangular in cross section, as in In Figure '7 the upper bars 35are of -shaped cross section but with the apex flattened on to preventcutting the straw which is swept over them by the separating cylinderis. The lower row of bars 31 are of similar V-shaped cross section withthe apex flattened, but the bars are inverted with the apex facingrearwardly. In Figure 3 the upper bars 26 are cylindrical, as in Figure3, while the lower bars are slightly curved in a flat V or U shape.

Thus'it is evident that there are several shapes of deflecting andsub-deflecting bars which can be used in carrying out the principles ofmy invention, the essential feature of which is that the lower or rearrow of bars is not only staggered with relation to the front row but thewidth of the bars in the rear row is substantially equal to the width ofthe spaces in the front row to prevent grain from being thrownrearwardly through the grate without being deflected by one or the otherof the rows of bars.

I do not intend my invention to be limited. to the exact details shownand described herein except as set forth in the following claim.

I claim:

In threshing apparatus including a cylinder and a concave cooperativetherewith, a finger grate disposed behind said concave and comprising anupper row of laterally spaced fingers inclined upwardly and rearwardly,the forward end of each finger being supported on said concave. the rearends of said fingers curving toward a horizontal position, and a lowerrow of laterally spaced fingers supported substantially parallel withsaid upper row and positioned to overlap the spaces between the fingersin said upper row.

LOUIS A. PARADISE.

